I just installed 12 inch rotors on my '96 rwd Ranger.
When I got it, with stock 14 inch tires and stock brakes, it was
definitely under-tired. Then I put on 16 inch rims and 225/70-16
Michelin tires - and i found it totally under braked/over tired.
Putting on the 12 inch (Sport Trac) rotors has shifted the balance in
favour of the brakes!! I can hold the tires on the edge of sliding at
60 mph now with no problem at all. - or thow it into full antilock.
On Tue, 16 Jun 2015 23:55:04 +0000 (UTC), Kevin Bottorff
This only works with 1995 and newer twin beam suspension rwd trucks.
(or older ones with 1995 or newer knuckles - 2 piston calipers)
2002 + SportTrak 2wd rotors with new bearings and seals, a set of new
premium pads to fit the ranger, and a set of custom made spacers made
of 3/8 x 2 ich cold rolled steel and some 1 inch steel shafting.
Measure the bolt spacing (6.843") and the required offset (0,975").
Lay out and accuratel drill the holes on the 2 8 inch long CRS bars.
Take the hunk of shafting, minimum 4 inches long, and slice off one
side so you have about an eighth of an inch of "meat" left after
drilling the 15/32 hole in the center of the shaft - I did it on a
bandsaw with the shaft clamped to an angle iron to keep it from trying
to spin. Cut the chunks about an inch long and chuck them in the 3
jaw chuck of the lathe to face to length Aprox 0.845") and drill.
I sanded the cut face smooth to make them look good, then bolted them
onto the plates with the flats facing the other hole, then welded them
together. You'l need 4 12 mm 12.2 or better (hardened) bolts with
small heads and nuts to fit. I used allen heads - with a grip length
of about 30mm ( just over an inch) - that means the non-threaded
section of the bolt - you will cut off the threaded portion that
extends beyond the bolt.
You will also need a set of caliper bolts about 3/8" longer than the
stock ones - available from good auto parts jobbers.
You will need to grind the steering knuclke so the flats of the
spacers can go in far enough to align the bolts, and then you will
need to gring the caliper frames to allow them to align with the bolt
holes on the adapters. I put the allen heads on the knuckle side, with
the nuts towards the rotor, with a hard washer under the head, with
one edge ground flat to give clearance for the caliper bolt head and
washer - which might also need some griding depending on what bolt you
May need to redrill the spacers to 31/64" to get the shanks of the
12mm bilts to fit cleanly.
Then I removed the backing plate/splash pan and beat it flat with a
hammer on an anvil so it doesn't touch the rotor. The "middle" 4mm
bolt that holds the pan on should be replaced with a "pan head" screw
- I didn;t do this so I had to grind the head of the bolt almost off
to provide clearance between it and the installed rotor. Install the
rotors, the bolt on the caliper frames (with new slider bolts and
rubbers installed and lubed with Sil Glyde) then install the new pads
and the calipers.
Bolt on the (minimum 16 inch) wheels and away you go.
REMEMBER - the 12mm caliper bolts get torqued to 80 ft lbs, and a bit
of blue (medium) loc-tite doesn't hurt!!!
On Wed, 17 Jun 2015 22:00:51 +0000 (UTC), Kevin Bottorff
Then you are out of luck for this conversion. Only works up to 1997.
There might be a way of doing it, but the spacer situation will be
different. Might be able to graft on the 11 inchers from a 2001 and up
Ranger - - -
> GUEST wrote:
> I just installed 12 inch rotors on my '96 rwd Ranger.
> When I got it, with stock 14 inch tires and stock brakes, it was
> definitely under-tired. Then I put on 16 inch rims and 225/70-16
> Michelin tires - and i found it totally under braked/over tired.
> Putting on the 12 inch (Sport Trac) rotors has shifted the balance
> favour of the brakes!! I can hold the tires on the edge of sliding
> 60 mph now with no problem at all. - or thow it into full
When you installed the 12-inch Sport trak rotors,
what size was the tire again?
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